Understanding tree biology is essential for defensible tree risk assessment.In this video, we break down how wood structure, cellulose, lignin, reaction wood, woundwood, and decay directly influence likelihood of failure under ANSI A300 Part 9. If you are preparing for the ISA Tree Risk Assessment Qualification (TRAQ) or want to strengthen your professional judgment as an arborist, this deep dive connects structural biology to real-world risk ratings.We explain:• Load vs resistance• Brown rot vs white rot and strength loss• Tension wood vs compression wood• Residual wall thickness and hollow stems• Health, vigor, and decay progression• Compartmentalization (CODIT)• How biology affects likelihood of failure within a specified time frameTree risk assessment is not defect spotting. It is biological interpretation. This video will help you evaluate structural integrity, decay impact, and adaptive growth responses in a way that aligns with ANSI A300 Part 9 standards and ISA TRAQ methodology.Whether you are a consulting arborist, municipal forester, tree care professional, or TRAQ candidate, this is foundational knowledge for defensible, science-based tree risk assessment.#TreeRiskAssessment #Arborist #TRAQ #ANSIA300 #TreeBiology #UrbanForestry #BCMA #TreeFailure

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